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My boost zone app6/1/2023 At the top of that list was heart rate training.” Six-time World Champion Allen even said: “During my 15 years of racing in the sport of triathlons I searched for those few golden tools that would allow me to maximize my training time and come up with the race results I envisioned. Back in the 1990’s, World Champion IRONMAN triathletes like Paula Newby-Fraser and Mark Allen were dominating the sport, using heart rate (HR) for all their key sessions.
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